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Re: TV powermates vs. Barlows

Subject: Re: TV powermates vs. Barlows
From: Mike Ruskai
Date: Sun, 14 May 2006 04:06:12 GMT
Newsgroups: sci.astro.amateur
On or about Thu, 11 May 2006 14:37:46 -0700 (PDT) did brian@xxxxxxx
(Brian Tung) dribble thusly:

>Little Bummer Boy wrote:
>> Wow!!..what a review. I have a C 80 ED 7.5 FR scope with a shorter draw 
>> tube. Does the powermate only work when it is in a diagonal or can it
>> go directly into the focuser without affecting focus? 
>
>It's not *supposed* to affect focus.  Whether it does or not, I really
>haven't tested out.  It didn't seem to affect focus significantly on
>either of the scopes I've tested it out with, but as you can tell from
>my use of the word "either," my testing hasn't been exactly extensive.
>
>At any rate, if my guess is right, then if you can come to focus without
>either the diagonal or the Powermate, then you should be able to reach
>focus with the Powermate, going directly into the focuser.  I think it's
>supposed to be one of the benefits of the Powermate, this "parfocality"
>business.

TV states that the Powermate is parfocal for TV eyepieces.

It's not for Meade Plossls (personal experienced), but I expect to
have to refocus when I change the EP anyway.

-- 
 - Mike

Ignore the Python in me to send e-mail.

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